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Changes since the most recent release will accumulate here.

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Minor changes

  1. Update the referenced version of OAuth Client ID Metadata Document from draft-ietf-oauth-client-id-metadata-document-00 to draft-ietf-oauth-client-id-metadata-document-03. MCP implementations that support Client ID Metadata Documents MUST follow this version.

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Other schema changes

  1. Restore the optional _meta field on CreateMessageRequestParams, ElicitRequestFormParams, ElicitRequestURLParams, ElicitResult, and ListRootsResult. It was unintentionally dropped in 2026-07-28 when these types stopped extending TaskAugmentedRequestParams and Result, leaving ListRootsRequest as the only input request that could carry _meta (#3468).